\begin{tikzpicture}
    \tkzDefPoints{0/0/C, 3/0/D, 0.3/2/A, 2.6/2/B}

    \tkzDrawSegments(A,B  B,C  C,D)
    \tkzLabelPoints[left](A,C)
    \tkzLabelPoints[right](B,D)
\end{tikzpicture}

